Improve documentation #112

Job	Run time
musllinux (x86_64-unknown-linux-musl)	1m 6s
macos	2m 12s
musllinux (i686-unknown-linux-musl)	49s
linux (x86_64)	1m 11s
linux-cross (aarch64)	3m 23s
linux (i686)	1m 26s
linux-cross (armv7)	3m 34s
musllinux-cross (aarch64-unknown-linux-musl, aarch64)	1m 54s
linux-cross (s390x)	3m 24s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	1m 53s
linux-cross (ppc64le)	3m 50s
windows (x64)	2m 21s
linux-cross (ppc64)	1m 42s
windows (x86)	1m 14s
Release	0s
	29m 59s

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